Prince Harry says he has enough material to write more memoirs and chose not to release some details, fearing his father and brother would never forgive him if they were released.
In an interview with the Daily Telegraph, the Duke of Sussex also said the original transcript for Spare was twice as long as the final draft and he had found it difficult to figure out what to remove.
Many of the details that were eventually excised, he added, involved both his father and brother.
“The first draft was different,” he told interviewer Bryony Gordon. “It was 800 pages and now it’s only 400 pages. It could have been two books, to put it that way. And the hard part was taking things out.”
He added: “There have been some things that have happened, especially between me and my brother and to an extent between me and my dad, that I just don’t want the world to know about. Because I don’t think they would ever forgive me.”
The Spare went on sale in the UK on Tuesday but had already been heavily re-hauled after specimens were accidentally put up for sale early in Spain.
The Guardian was the first to reveal details from the memoir, including the claim that Prince William attacked Harry after a tense discussion about Meghan, the Duchess of Sussex.
Kensington Palace and Buckingham Palace have said they will not comment on the book’s content.
Prince Harry also speaks about a lack of support for him and Meghan.
News of excess material is likely to continue to worry the royal family.
In the interview, Harry said he knew he would be “devastated” if he included anything about his family, but that he could not have written the memoir without including it.
He was also critical of the press, claiming the media has “a lot of dirt on my family, I know they have it, and they sweep it under the rug for juicy stories about someone else”.
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The Duke reiterated that he was not trying to destroy the monarchy but to reform it.
Regarding Prince William’s children – George, 9, Charlotte, 7, and Louis, 4, – Prince Harry said at least one of his brother’s children will be a “surrogate” and that it “hurts” him and ” concerned”.
“It’s not about overthrowing the monarchy – it’s about saving it from itself,” he added. “I know I will be crucified by numerous people who say this.”
He suggested that over time the royal family could thank him for speaking so openly about his trauma.
Meanwhile, he admitted that trying to transform “an institution” and the media landscape is “no small task” but that he uses “long-term, strategic thinking” to meet this “enormous” challenge.